Minerva Fabienne Hase and Nikita Volodin lead the pairs short program at the World Figure Skating Championships in Prague as they target their first world title.Japan star Kaori Sakamoto holds the top spot in the women's event during her final professional appearance before retirement.The German duo narrowly edges out Georgian rivals Anastasiia Metelkina and Luka Berulawa ahead of the decisive free skate on Thursday.